Ore pass raise collar (Underground Mine and Shaft Works)
A tipping point over an ore pass raise: a concrete collar around a 2 m square opening, heavy grizzly bars, a kickboard kerb, a side chute and a control stand.
- 格式
- GLB
- 文件大小
- 17 KB
- 三角面
- 288
- 许可
- CC0 1.0